热压通风即平常所讲的“烟囱效应”。其原理为热空气上升,从建筑上部风口排

Hot-pressed ventilation is commonly referred to as the "chimney effect". The principle is that the hot air rises and is discharged from the upper tuyere of the building, and the outdoor fresh cold air is sucked in from the bottom of the building. The greater the temperature difference between the indoor and outdoor air, the greater the height difference between the air inlet and outlet, the stronger the heat pressure effect. For areas with little outdoor wind speed, the ventilation effect produced by the chimney effect is a good way to improve thermal comfort. <br>Due to the instability of natural wind, or the influence of surrounding tall buildings and vegetation, in many cases, there is insufficient wind pressure around the building. It is necessary to use the principle of hot pressing to accelerate natural ventilation. <br>Compared with the use of wind pressure ventilation, the air flow generated by the chimney effect is relatively slow. Although it can meet the requirements of the number of ventilations, it is often necessary to supplement the wind pressure to achieve the wind speed required for rapid evaporation refrigeration. <br>Wind environment design In winter, the main consideration is that the outdoor activities of the building should be sheltered from the wind as much as possible, and some local areas of the building should be prevented from causing cold wind to penetrate the interior due to the wind pressure. In summer, we mainly consider the use of wind to reduce the temperature in open spaces to improve comfort and the use of wind to dissipate heat on the surface of buildings. At the same time, we should take full advantage of natural ventilation indoors to reduce the age of indoor air.

热压通风即平常所讲的“烟囱效应”。其原理为热空气上升,从建筑上部风口排出,室外新鲜的冷空气从建筑底部被吸入。室内外空气温度差越大,进出风口高度差越大,则热压作用越强。对于室外环境风速不大的地区,烟囱效应所产生的通风效果是改善热舒适的良好手段。<br>由于自然风的不稳定性,或由于周围高大建筑、植被的影响,许多情况下在建筑周围形不成足够的风压。就需要利用热压原理来加速自然通风。<br>与利用风压通风相比,烟囱效应所产生的空气流动相对较慢,虽然可以满足换气次数的要求,然而要想达到快速蒸发制冷所需的风速,往往还需风压作补充。<br>风环境设计冬季主要考虑建筑室外活动地点应尽可能避风，并且避免建筑某些局部区域因为风压过大致使冷风渗透到室内。夏季主要考虑露天场所借助风力降低气温，提高舒适化及建筑物表面利用风力散热，同时考虑室内充分利用自然通风，降低室内空气龄。

Hot pressure ventilation is commonly known as "chimney effect". The principle is that the hot air rises and is discharged from the air outlet at the upper part of the building, and the fresh cold air outside is inhaled from the bottom of the building. The greater the temperature difference between indoor and outdoor air, the greater the height difference between air inlet and outlet, the stronger the thermal pressure effect. The ventilation effect of chimney effect is a good way to improve thermal comfort in the area with small outdoor wind speed.<br>Due to the instability of natural wind, or due to the influence of tall buildings and vegetation around, in many cases, there is not enough wind pressure around the building. We need to use the principle of thermal pressure to accelerate natural ventilation.<br>Compared with the use of wind pressure ventilation, the air flow caused by chimney effect is relatively slow, although it can meet the requirements of air change times, but to achieve the required wind speed for rapid evaporation refrigeration, wind pressure is often needed to supplement.<br>In the design of wind environment in winter, it is mainly considered that the outdoor activity site of the building should be kept away from the wind as much as possible, and some local areas of the building should be avoided because the wind pressure is too high to make the cold wind infiltrate into the room. In summer, it is mainly considered to reduce the air temperature in the open air, improve the comfort and heat dissipation of the building surface by using the wind, and at the same time, it is considered to make full use of the natural ventilation indoors to reduce the indoor air age.<br>